Nozzle monitor

ABSTRACT

A nozzle monitor is disclosed. The monitor includes a hollow trunnion rotatably mounted on fluid delivery conduits. A fluid cylinder device, acting through continuous loop chain and sprocket assemblies, rotates the trunnion about a first axis. A spray nozzle assembly, including an elbow, is rotatably mounted on the trunnion and is capable of rotating in a 360* arc about a second axis which is orthogonal to the first mentioned axis. A rotary motor and transmission drives the spray nozzle assembly. The spray nozzle includes a slidable front section for varying the spray pattern of fluid issuing from the nozzle. A control system for the slidable section of the nozzle includes a fluid cylinder mounted on the trunnion, and a reciprocable element extending from the trunnion to the spray nozzle assembly along the axis of rotation of the spray nozzle assembly. The spray pattern can be controlled in any position of rotation of the spray nozzle assembly with respect to the trunnion.

[ Oct. 28, 1975 Primary ExaminerM. Henson Wood, Jr. Assistant Examiner-Michael Mar Attorney, Agent, or Firm Synnestvedt & Lechner [57] ABSTRACT A nozzle monitor is disclosed. The monitor includes a hollow trunnion rotatably mounted on fluid delivery conduits. A fluid cylinder device, acting through continuous loop chain and sprocket assemblies, rotates the trunnion about a first axis. A spray nozzle assembly, including an elbow, is rotatably mounted on the trunnion and is capable of rotating in a 360 are about a second axis which is orthogonal to the first mentioned axis. A rotary motor and transmission drives the spray nozzle assembly. The spray nozzle includes a slidable front section for varying the spray pattern of fluid issuing from the nozzle. A control system for the slidable section of the nozzle includes a fluid cylinder Inventor: Walter C. Updegrave, Reading, Pa.

Reading, Pa.

May 28, 1975 US. Cl. 239/456; 239/587; 285/190 [51] Int. B0513 3/02 169/24, 25; 239/587, 456, 239/460, 164, 166; 285/190 References Cited UNITED STATES PATENTS United States Patent [1 1 Updegrave 154] NOZZLE MONITOR [73] Assignee: Reading Techmatic Corporation,

22 Filed:

211 App]. No.:' 473,592

[58] Field of Search........

mounted on the trunnion, and a reciprocable element extending from the trunnion to the spray nozzle assembly along the axis of rotation of the spray nozzle assembly. The spray pattern can be controlled in any position of rotation of the spray nozzle assembly with respect to the trunnion.

20 Claims, 2 Drawing Figures 239/587 X 239/456 UX n q m 0 4, \v m m I mmm m m mnm W wU Se Sn dS Kei mit ai SGAWDR 413 3 5 6777 9999mm WH MW 99 22 2 4526 56370 v a 1 9 v 1 U.S. Patent )ct.28, 1975 Sheet 1 of2 3,915,389

US. Patent Oct. 28, 1975 Sheet2of2 3,915,389

FIG. 2

NOZZLE MONITOR BACKGROUND OF THE INVENTION 1. FIELD OF THE INVENTION Various types of fire fighting equipment and other fluid spraying equipment have come into use, which equipment employs a nozzle mounted on one extremity of a boom. The boom may be telescopically extensible or articulated, and is mounted for rotation and elevation, usually on the chassis of a vehicle, for example, a fire truck. The nozzle may be supplied with fluids under pressure, for instance, water or foam, through conduits extending inside the boom, which deliver such fluid from pressurizing means such as pumps mounted on the vehicle chassis. In some of these designs, a receptacle called a bucket is mounted at the end of the boom, and during use, a person stands or sits in the bucket and controls the direction of the fluid issuing from the nozzle. However, in many situations, for instance fire fighting, it is undesirable to have a person disposed at the end of the boom because of the proximity of the nozzle to dangerous conditions, such as the heat and smoke of a fire. The presence of a person also restricts the closeness with which the nozzle can be placed adjacent dangerous areas. For this reason, nozzle monitor assemblies which control the direction and pattern of the spray issuing from the nozzle from a point remote from the upper extremity of the boom have been designed. The operator of the nozzle is positioned at a point remote from the nozzle, usually somewhere on the vehicle carrying the boom. This invention relates to such nozzle monitor assemblies and particularly to nozzle monitor assemblies which are used for spraying water or foams onto fires.

2. DESCRIPTION OF THE PRIOR ART An example of a known monitor assembly is shown in US. Pat. No. 3,599,722 to Davidson and Morris. In this design, a nozzle monitor assembly is mounted on the end of a boom for oscillation on a horizontal axis, and a nozzle assembly is mounted to oscillate on an axis spaced laterally from the first mentioned axis. In the aforenoted design, the nozzle assembly is mounted substantiallyin alignment with the first axis to oscillate about a second axis laterally displaced from the first axis. The horizontal sweep of the spray nozzle is very limited and does not normally exceed about 90. Thus, in this design, the spray can be directed only forwardly the first axis, and not in directions aligned with or behind the first axis. Because the range of movement of the spray nozzle is limited in this design, it is many times necessary to reposition the entire boom in order to direct the stream of water onto various parts of a fire. This operation consumes time and operator attention, and extends the time necessary to fight the fire. Another feature of this design that is undesirable is the extensive amount of exposed high pressure hydraulic hose which must be utilized for conveying fluid under pressure to the various motors of the nozzle monitor assembly. Because of the relatively long lengths of hose used, problems of kinking, snagging and pinching of the hose as well as failure of the hose resulting from exposure to heat can occur more readily. In addition, in the .prior design the flow of water or foam through the monitor assembly is subjected to four substantially 90 direction changes which results in energy losses in the fluid stream and consequently greater power requirements to pump the fluid through the monitor assembly.

SUMMARY OF THE INVENTION To avoid the foregoing disadvantages, the nozzle monitor disclosed includes a trunnion mounted for rotation on a first axis atthe end of the boom. A spray nozzle assembly is mounted on the trunnion for rotation about an axis which is orthogonal to the axis of rotation of the trunnion. The spray nozzle assembly is mounted out of the plane of, or in Offset relation to,- the trunnion, for example by an elbow, which is capable of rotating 360 about the second axis with respect to the trunnion. Hydraulic hose exposure is kept to a minimum by the use of a fluid cylinder device disposed in the end section of the boom, which is utilized to rotate the trunnion about its axis of rotation, and by the mounting of a fluid cylinder device on the trunnion to actuate a control system for controlling a spray pattern varying device incorporated into the spray nozzle.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an isometric, partially fragmented view of a nozzle monitor in accordance with the present invention.

FIG. 2 is a side elevation, partially in section, of a nozzle monitor in accordance with the invention, and showing a preferred form of mechanism for controlling the spray pattern of the spray noule.

DESCRIPTION OF THE PREFERRED EMBODIMENT With reference to FIG. 1, there is shown therein a nozzle monitor assembly 10 mounted at the end of the boom 11. The boom 11 may be of the type which is mounted on a vehicle, and which is capable of movement in horizontal and vertical directions. The boom 11 carries at its upper end a fluid-carrying assembly comprised of a pair of opposed conduits 12a and 12b, which may intersect with and are in fluid communication with a high pressure fluid-carrying conduit (now shown) mounted on the boom. In fire fighting apparatus, the pressurized fluid carried by the conduits may be water or foam.

The nozzle monitor assembly 10 includes a hollow, T-shaped trunnion 14. The trunnion 14 is rotatably mounted to the ends of the conduits 12a, 12b, in such a manner to provide a fluidtight coupling between the trunnion and the conduits 12a, 12b. In the preferred embodiment the trunnion 14 is mounted to the conduits 12a, 12b, and the conduits 12a, 12b are mounted to the boom 11 in a manner such that the axis of rotation of the trunnion AA is parallel to the ground, i.e., horizontally disposed. However, it should be noted that it may be desirable in other applications to vary this orientation. The trunnion 14 includes a stem section 15 disposed generally medially of the ends of trunnion 14. The stem section 15 rotatably receives an elbow section 16 which is mounted in fluid-tight communication with the stem section 15. The elbow section is preferrably or less. The elbow section is mounted to rotate about the axis BB which is orthogonal to the axis of rotation AA of the trunnion 14. The axes AA and B-B need not intersect, but in the preferred embodiment illustrated, these axes do intersect each other. The elbow section 16 is mounted for complete 360 rotation with respect to the trunnion 14 about the axis BB.

As the trunnion 14 is rotated about axis AA, an imaginary plane is generated by the axis BB of the elbow section 16, which imaginary plane is perpendicular to the axis AA.

A spray nozzle 18 is mounted in fluid communication with the discharge end of the elbow 16. By the use of the elbow section, the nozzle can be offset from the trunnion and is capable of being rotated 360 as heretofore described. The spray nozzle 18 is of a type having a relatively movable front section 19, which is movable longitudinally to change the spray dispersion pattern of the fluid issuing from the nozzle. A control system for moving the slidable section 19 will be discussed more fully hereinafter.

As can be readily seen, the fluid under pressure delivered to the conduits 12a and 12b is carried thereby to each end of the hollow trunnion 14. The fluid flows through the stem section of the trunnion into the elbow l6 and spray nozzle assembly 18.

Referring to FIG. 1, the trunnion 14 is rotated about the axis AA by a drive system comprised of a pair of roller chain and sprocket assemblies. The chain and sprocket assemblies are comprised of driven sprockets 20, which are mounted on each side of the trunnion 14. Roller chains 21 are entrained over each of the sprockets 20, and are supported in a continuous loop configuration by idler sprockets 22. Idler sprockets 22 are rotatably mounted on the end of boom 11 by suitable bearings, and are also adjustable in the longitudinal direction of the chain to adjust the tension in the chain. An hydraulic cylinder 23 is mounted on the end of boom 11. The drive rod of hydraulic cylinder 23 extends forwardly and is attached by a suitable connection to a cross bar 24, preferably at the midpoint thereof. The cross bar 24 is attached at each end to the chains 21,21, for example by pins or bolts, and is carried thereby.

Hydraulic cylinder 23 is controlled by a conventional 3position four-way hydraulic valve (not shown) mounted on the end of boom 11. In one position of such a valve, no fluid is applied to the hydraulic cylinder 23, and the cylinder drive rod remains stationary. When the valve is moved to a second position, for example, by an electrical control such as a solenoid, fluid is supplied to the cylinder to extend the drive rod forwardly toward the trunnion 14. This causes the cross bar 24 to move forwardly, thereby causing the chains to move in a direction which causes driven sprockets 20, and therefore trunnion 14, to move in a clockwise direction, as viewed in FIG. 1. Conversely, when the valve is moved to the third position, fluid under pressure is supplied to the hydraulic cylinder 23 in a manner to cause the drive rod to move rearwardly toward the boom 11. This causes the trunnion 14 to be rotated about axis AA in a direction reverse from that previously described.

Referring to FIG. 2, the elbow 16 and nozzle assembly 18 are rotated relative to the trunnion 14 about axis BB by a rotary motor such as hydraulic motor 27. Motor 27 is mounted on the trunnion 14 and rotates the elbow section 16 through a chain and sprocket transmission, which includes drive sprocket 25, roller chain 26, and sprocket 28, which is fixedly mounted on the elbow section 16. The motor 24 is controlled by a three-position four-way hydraulic valve of the type previously described in connection with the description of the operation of hydraulic cylinder 23.

Again referring to FIG. 2, as previously noted, the spray nozzle assembly 18 includes a slidable nozzle section 19, which is movable to vary the pattern of the fluid flow issuing from the nozzle 18. When the section 19 is disposed forwardly (to the right as shown in FIG. 2), a constricted, more narrow spray issues from the nozzle. If the section 19 is moved rearwardly (to the left as shown in FIG. 2), the spray pattern becomes wider and more diffused.

Section 19 is caused to slide by the following mechanism. An hydraulic cylinder 29 is mounted in fluid-tight relationship on the trunnion 14. The hydraulic cylinder 29 actuates a rod 30 which extends from the cylinder 29 through the stem 15 of trunnion l4 and through a portion of the elbow section 16. The outer end of the rod 30, as viewed in FIG. 2, extends through a side wall of the elbow 16, there being a suitable fluid seal positioned at the point where rod 30 passes through the side wall of the elbow section. Rod 30 is a substantially straight member and is positioned so that its longitudinal axis lies along and is coincident with the axis of rotation B-B of the elbow section 16. An annular collar 31 is mounted on the end of the rod 30 which extends through the side wall of the elbow section 16. A pair of support members 32 disposed on opposite sides of the elbow section 16 rotatably support a bellcrank assembly 33. One end of the bellcrank assembly 33 carries a pair of pins or fingers 34 which are slidably received in the recessed groove portion of the collar 31. A link 35 is pivotally connected at one end to the bellcrank 33, and at the other end to the slidable nozzle section 19. The link 35 may be guided and held in place by a pair of pins 36 which are disposed on either side of the link 35.

The slidable section 19 is caused to slide in the following manner. A three-position four-way hydraulic control valve, of the type previously discussed in connection with the operation of hydraulic cylinder 23 and motor 27, is utilized to control the application of fluid under pressure to the hydraulic cylinder 29. Movement of the operating member of hydraulic cylinder 29 in turn causes rod 30 to move axially. When, for example, the rod moves in a direction to move the collar 31 away from the elbow section 16 because of the engagement of the fingers 34 with the collar 31, the bell crank 33 is moved in a counterclockwise direction (as viewed in FIG. 2). This in turn causes the link 35 to move slidable section 19 rearwardly, or to the left as viewed in FIG. 2. Conversely, when the rod 30 is caused to move the collar 31 toward the elbow section, the parts just described move in a reverse direction.

An important feature of the nozzle spray pattern control mechanism just described is that the mechanism operates in any position of rotation of the elbow section 16 with respect to the trunnion 14. This result is achieved because the rod 30 is disposed with its longitudinal axis coincident with the axis of rotation 8-8 of the elbow 16, and because the fingers 34 are free to slide in the groove of the collar 31 as the rotation of the elbow section carries bellcrank 33 in a circular path.

It can be readily seen that because of the offset mounting of the spray nozzle by means of the elbow section, the lateral sweep of the nozzle is greatly increased over prior designs, and, in fact, the nozzle can be rotated through 360. Thus, the spray from the noz- -zle can be directed laterally to both sides of the boom the boom as well as forwardly from the tip of the boom. This freedom of movement reduces the need to reposition the boom in many instances, and allows the spray to be directed on difficult-to-reach areas for example, areas which are disposed to the sides of the boom.

In addition, the nozzle spray pattern can be controlled at any point of the rotation of the spray nozzle. Further, because the hydraulic cylinder for controlling the spray pattern is disposed on the trunnion rather than on the spray nozzle as in prior designs, the length of the hydraulic lines used for this purpose can be reduced and can be maintained substantially within the side walls of the nozzle monitor assembly. A similar reduction in hose exposure results from the placement of the hydraulic cylinder 23 in the rearwardly disposed postion of the nozzle monitor assembly.

Another advantage of the foregoing design is-that the fluid flow path through the assembly is much smoother. This results because the fluid undergoes at least one less change in direction than in other known'designs as it flows to the spray nozzle. The fluid makes a first 90 direction change flowing from conduits 12 into trunnion 14, makes a second 90 change flowing from the trunnion into elbow 16, and then is subjected to a smooth path transition as it flows through the largeradius, smooth walled elbow to the spraynozzle. This smooths the fluid flow and reduces pumping losses through the assembly, thereby requiring less pumping pressures to achieve comparable nozzle exit velocities.

I claim:

1. A nozzle monitor assembly comprising:

conduit means for carrying fluid under pressure;

a substantially T-shaped hollow trunnion for receiving fluid from the conduit means;

means, rotatably mounting the trunnion for rotation about a first axis;

drive means for rotating the trunnion in opposed directions about the first axis;

an elbow with one leg thereof in fluid communication with a stem portion of the trunnion;

means rotatably mounting the elbow on the trunnion for rotation in excess of about 180 about an axis which lies in a plane, which plane is orthogonal to the first axis;

a drive means for rotating the elbow; and

a spray nozzle in fluid communication with a second leg of the elbow.

2. A nozzle monitor assembly as in claim 1 wherein the axis of rotation of the elbow intersects the first axis.

3. A nozzle monitor assembly as in claim 1 wherein the axis of rotation of the elbow and the first axis are in a common plane.

4. A nozzle monitor assembly as in claim 1 wherein the elbow is mounted for 360 rotation with respect to the trunnion.

5. A nozzle monitor as in claim 1 wherein means for rotating the elbow is mounted on the trunnion.

6. A nozzle monitor as in claim 5 wherein the means for rotating the elbow comprises a rotary fluid motor and transmission means for transmitting rotation of the fluid motor to the elbow.

7. A nozzle monitor as in claim 1 wherein the elbow is a 90 elbow.

8. A nozzle monitor assembly as in claim 1 wherein the means for rotating the trunnion comprise a sprocket, a flexible continuous drive member for driving the sprocket, a fluid cylinder device, and means for interconnecting the fluid cylinder device and the flexible drive means whereby movement of the fluid cylinder device drives the flexible drive means, thereby causing the rotation of the trunnion.

9. A nozzle monitor assembly comprising a first part for conveying fluid, an elbow for conveying fluid in fluid communication with the first part, means rotatably mounting the elbow on the first part, a spray nozzle mounted on the elbow, the spray nozzle including means for varying the spray pattern of fluid flowing from the spra'ynozzle, control means for controlling the spray pattern varying means comprising a movable means mounted on the elbow, an actuating member extending between the first part and the elbow along the axis of rotation of the elbow with respect'to the first part, means carried by the movable means for engaging the actuating member, and link means for interconnecting the movable means and the spray pattern varying means, whereby movement of the movable means by the actuating means causes thev spray pattern varying means to vary the pattern of fluid sprayed from the nozzle.

10. A nozzle monitor assembly as in claim 9 wherein the elbow is mounted for 360 rotation with respect to the first part.

11. A nozzle monitor assembly as in claim 9 wherein a fluid motor means for driving the actuating member is mounted on the first part.

12. A nozzle monitor assembly as in claim 1 lwherein a collar is mounted on the actuating member and the movable means includes means for engaging the collar.

13. A nozzle assembly as in claim 9 wherein the movable means comprises a lever and means pivotally mounting the lever on the elbow.

14. A nozzle monitor assembly comprising:

conduit means for carrying fluid under pressure;

a hollow trunnion means for receiving fluid from the conduit means;

means rotatably mounting the trunnion-means for rotation about a first axis;

means for rotating the trunnion about the first axis;

an elbow with one leg thereof in fluid communication with the trunnion;

means rotatably mounting the elbow on the trunnion for rotation in excess of about 180 about an axis which lies in a plane, which plane is orthogonal to the first axis;

drive means for rotating the elbow;

a spray nozzle in fluid communication with a second leg of the elbow;

and means for varying the spray pattern of fluid sprayed from the nozzle including control means mounted on the trunnion and extending along the axis of rotation of the elbow.

15. Apparatus as in claim 14 wherein the control means includes a reciprocable member reciprocable along an axis coincident with the second axis and linkage means for transmitting movement of the reciprocable member to the spray pattern varying means.

16. A nozzle monitor as in claim '15 wherein the reciprocable means is a rod extending through portions of the trunnion and the elbow and having a collar mounted on a portion thereof, and wherein the linkage means includes lever means for slidably engaging the collar, whereby movement of the rod imparts movement to the lever means, and means for operatively associating the lever means with the spray pattern varying means.

17. A nozzle monitor assembly comprising: conduit means for carrying fluid under pressure;

a sprocket mounted on the trunnion a flexible drive member entrained on the sprocket and extending rearwardly thereof a fluid cylinder device mounted on the boom and a hollow trunnion means for receiving fluid from the having a longitudinally movable output member, conduit means; the direction of movement of the output member means rotatably mounting the trunnion means for robeing generally parallel to the longitudinal axis of tation for. about a first axis; the boom,

an elbow with one leg thereof in fluid communication and means interconnecting the fluid cylinder dewith the trunnion; 10 vice and the drive member whereby movement means for rotating the trunnion about the first axis comprising a pair of sprockets mounted on the trunnion, one on each side of the elbow, a flexible of the output member drives the flexible drive means, thereby causing rotation of the trunnion. 19. Apparatus as in claim 18 and further comprising an idler sprocket rotatably mounted on the assembly, the flexible drive member being entrained in a continuous loop on the idler sprocket and the trunnionmounted sprocket.

continuous drive member entrained on each of the sprockets, idler sprockets for carrying each flexible 5 drive member, a fluid cylinder device mounted on the monitor assembly, and means for interconnecting the fluid cylinder device with each of the flexible drive members whereby movement of the fluid 20. A nozzle positioning assembly including: a pair of opposed conduits for carrying fluid under cylinder device drives the flexible drive member, 20 pressure; thereby imparting rotation of the trunnion about a hollow trunnion having a first portion extending bethe first axis; tween and in fluid communication with the conmeans rotatably mounting the elbow on the trunnion duits;

for rotation in excess of about 180 about an axis means rotatably, and in a fluid tight manner, mountwhich lies in a plane, which plane is orthogonal to ing each end of the first portion of the trunnion on the first axis; each of the conduits whereby the trunnion is drive means for rotating the elbow; mounted for arcuate movement about a first axis; and a spray nozzle in fluid communication with a secmeans for arcuately moving the trunnion about the 0nd leg of the elbow. first axis; 18. A boom mounted nozzle assembly and drive systhe trunnion having a second portion mounted on tem therefor comprising: and in fluid communication with the first portion, a boom; and extending in angular relation with respect to a conduit mounted on the boom for carrying fluid the first portion,

under pressure; an elbow section having an inlet section thereof in a hollow trunnion in fluid communication with the 5 fluid communication with the second portion of the conduit; trunnion, a nozzle in fluid communication with the trunnion; means rotatably mounting the elbow section on the means disposed at one end of the boom for mounting second portion of the trunnion for rotation in a the trunnion for arcuate movement with respect to 360 arc; and the boom about an axis normal to the longitudinal a nozzle mounted on and in fluid communication axis of the boom, and; with an outlet section of the elbow, the longitudinal drive means for arcuately moving the trunnion, comaxis of the nozzle being spaced from the first axis.

prising: 

1. A nozzle monitor assembly comprising: conduit means for carrying fluid under pressure; a substantially T-shaped hollow trunnion for receiving fluid from the conduit means; means, rotatably mounting the trunnion for rotation about a first axis; drive means for rotating the trunnion in opposed directions about the first axis; an elbow with one leg thereof in fluid communication with a stem portion of the trunnion; means rotatably mounting the elbow on the trunnion for rotation in excess of about 180* about an axis which lies in a plane, which plane is orthogonal to the first axis; a drive means for rotating the elbow; and a spray nozzle in fluid communication with a second leg of the elbow.
 2. A nozzle monitor assembly as in claim 1 wherein the axis of rotation of the elbow intersects the first axis.
 3. A nozzle monitor assembly as in claim 1 wherein the axis of rotation of the elbow and the first axis are in a common plane.
 4. A nozzle monitor assembly as in claim 1 wherein the elbow is mounted for 360* rotation with respect to the trunnion.
 5. A nozzle monitor as in claim 1 wherein means for rotating the elbow is mounted on the trunnion.
 6. A nozzle monitor as in claim 5 wherein the means for rotating the elbow comprises a rotary fluid motor and transmission means for transmitting rotation of the fluid motor to the elbow.
 7. A nozzle monitor as in claim 1 wherein the elbow is a 90* elbow.
 8. A nozzle monitor assembly as in claim 1 wherein the means for rotating the trunnion comprise a sprocket, a flexible continuous drive member for driving the sprocket, a fluid cylinder device, and means for interconnecting the fluid cylinder device and the flexible drive means whereby movement of the fluid cylinder device drives the flexible drive means, thereby causing rotation of the trunnion.
 9. A nozzle monitor assembly comprising a first part for conveying fluid, an elbow for conveying fluid in fluid communication with the first part, means rotatably mounting the elbow on the first part, a spray nozzle mounted on the elbow, the spray nozzle including means for varying the spray pattern of fluid flowing from the spray nozzle, control means for controlling the spray pattern varying means comprising a movable means mounted on the elbow, an actuating member extending between the first part and the elbow along the axis of rotation of the elbow with respect to the first part, means carried by the movable means for engaging the actuating member, and link means for interconnecting the movable means and the spray pattern varying means, whereby movement of the movable means by the actuating means causes the spray pattern varying means to vary the pattern of fluid sprayed from the nozzle.
 10. A nozzle monitor assembly as in claim 9 wherein the elbow is mounted for 360* rotation with respect to the first part.
 11. A nozzle monitor assembly as in claim 9 whereiN a fluid motor means for driving the actuating member is mounted on the first part.
 12. A nozzle monitor assembly as in claim 11 wherein a collar is mounted on the actuating member and the movable means includes means for engaging the collar.
 13. A nozzle assembly as in claim 9 wherein the movable means comprises a lever and means pivotally mounting the lever on the elbow.
 14. A nozzle monitor assembly comprising: conduit means for carrying fluid under pressure; a hollow trunnion means for receiving fluid from the conduit means; means rotatably mounting the trunnion means for rotation about a first axis; means for rotating the trunnion about the first axis; an elbow with one leg thereof in fluid communication with the trunnion; means rotatably mounting the elbow on the trunnion for rotation in excess of about 180* about an axis which lies in a plane, which plane is orthogonal to the first axis; drive means for rotating the elbow; a spray nozzle in fluid communication with a second leg of the elbow; and means for varying the spray pattern of fluid sprayed from the nozzle including control means mounted on the trunnion and extending along the axis of rotation of the elbow.
 15. Apparatus as in claim 14 wherein the control means includes a reciprocable member reciprocable along an axis coincident with the second axis and linkage means for transmitting movement of the reciprocable member to the spray pattern varying means.
 16. A nozzle monitor as in claim 15 wherein the reciprocable means is a rod extending through portions of the trunnion and the elbow and having a collar mounted on a portion thereof, and wherein the linkage means includes lever means for slidably engaging the collar, whereby movement of the rod imparts movement to the lever means, and means for operatively associating the lever means with the spray pattern varying means.
 17. A nozzle monitor assembly comprising: conduit means for carrying fluid under pressure; a hollow trunnion means for receiving fluid from the conduit means; means rotatably mounting the trunnion means for rotation for about a first axis; an elbow with one leg thereof in fluid communication with the trunnion; means for rotating the trunnion about the first axis comprising a pair of sprockets mounted on the trunnion, one on each side of the elbow, a flexible continuous drive member entrained on each of the sprockets, idler sprockets for carrying each flexible drive member, a fluid cylinder device mounted on the monitor assembly, and means for interconnecting the fluid cylinder device with each of the flexible drive members whereby movement of the fluid cylinder device drives the flexible drive member, thereby imparting rotation of the trunnion about the first axis; means rotatably mounting the elbow on the trunnion for rotation in excess of about 180* about an axis which lies in a plane, which plane is orthogonal to the first axis; drive means for rotating the elbow; and a spray nozzle in fluid communication with a second leg of the elbow.
 18. A boom mounted nozzle assembly and drive system therefor comprising: a boom; a conduit mounted on the boom for carrying fluid under pressure; a hollow trunnion in fluid communication with the conduit; a nozzle in fluid communication with the trunnion; means disposed at one end of the boom for mounting the trunnion for arcuate movement with respect to the boom about an axis normal to the longitudinal axis of the boom, and; drive means for arcuately moving the trunnion, comprising: a sprocket mounted on the trunnion a flexible drive member entrained on the sprocket and extending rearwardly thereof a fluid cylinder device mounted on the boom and having a longitudinally movable output member, the direction of movement of the output member being generally parallel to the longitudinal axis of the boom, and means interconnectinG the fluid cylinder device and the drive member whereby movement of the output member drives the flexible drive means, thereby causing rotation of the trunnion.
 19. Apparatus as in claim 18 and further comprising an idler sprocket rotatably mounted on the assembly, the flexible drive member being entrained in a continuous loop on the idler sprocket and the trunnion-mounted sprocket.
 20. A nozzle positioning assembly including: a pair of opposed conduits for carrying fluid under pressure; a hollow trunnion having a first portion extending between and in fluid communication with the conduits; means rotatably, and in a fluid tight manner, mounting each end of the first portion of the trunnion on each of the conduits whereby the trunnion is mounted for arcuate movement about a first axis; means for arcuately moving the trunnion about the first axis; the trunnion having a second portion mounted on and in fluid communication with the first portion, and extending in angular relation with respect to the first portion, an elbow section having an inlet section thereof in fluid communication with the second portion of the trunnion, means rotatably mounting the elbow section on the second portion of the trunnion for rotation in a 360* arc; and a nozzle mounted on and in fluid communication with an outlet section of the elbow, the longitudinal axis of the nozzle being spaced from the first axis. 